Die holder for pneumatic marking hammers and the like



Feb. 10, 1953 IE 2,627,803

DIE HOLDER FOR PNEUMATIC MARKING HAMMERS AND THE LIKE Filed March 2. 1948 FlELi.

IN VEN TOR.

E4]; PH 4 FAWN/5e, BY. aawt wv Patented Feb. 10, 1953 DIE HOLDER FOR PNEUMATIC MARKING HAMMERS AND THE LIKE Ralph A. Pannier, Pittsburgh, Pa., assignor to Pannier Bros. Stamp Company, a corporation of Pennsylvania Application March 2, 1948, Serial No. 12,598

6 Claims.

This invention relates to die holders for marking devices and more particularly to a cartridge type die holder for pneumatic marking hammers and the like.

Pneumatically operated hammers are frequently used for marking billets, slabs and other partially formed metal articles with identifying insignia. Since these insignia show not only heat and ingot numbers but also in many instances the portion of the ingot from which the articles were formed, it is necessary to frequently and quickly change the marking dies. Heretofore, the dies have been disposed in a die holder in the head of the hammer which is held therein by pins. The dies are in turn held in the holder by means of pinsextending through the holder and through grooves in the sides of the dies, which grooves provide a limited free or lost motion for the dies. In another arrangement, the dies are held directly in the head by pins with the foregoing lost motion arrangement. Thus to change the dies in the first arrangement, it is necessary to withdraw the die holder from the head of the hammer and then remove the dies from the holder. In changing either type, the holding pins must be removed and these are frequently dropped and lost on the mill floor. Even if the pins are not dropped and lost, considerable time is required for the changing of the dies.

It is accordingly an object of the present invention to overcome the foregoing difficulties and provide a die holder for pneumatic hammers and the like which permits quick changing of the dies.

It is another object of this invention to provide a die holder for pneumatic hammers and the like which is simple in design and rugged and durable in operation.

The foregoing and further objects will become apparent from the following description when read in conjunction with the attached drawing, wherein:

Figure 1 is a longitudinal view of a conventional pneumatic marking hammer embodying the die holder of my invention;

Figure 2 is an enlarged longitudinal sectional view in a horizontal plane showing the die holder and its mode of attachment to the hammer, with the holder in open position:

Figure 3 is a side elevation of the head of the hammer, likewise with the holder in open position;

Figure 4 is an end view; and

Figure 5 is a vertical section of the die holder taken on line V-V of Figure 3.

Referring more particularly to the drawing, the numeral 2 designates a conventional pneumatic marking hammer having an open-end annular- 2 like head 4 in which there is disposed a suitably actuated anvil or hammer member 5.

In accordance with the teachings f my invention, there is pivotally mounted on the forward end of the head 4, a die holder 8. The die holder is provided with a handle Ill and a spring-biased friction pin I2 is disposed in the head 4 which coacts with a depression M in the holder to hold it in operating position.

The die holder comprises a cover portion [6 and a rearwardly extending integral back portion It which fits within the head 4 of the hammer. One or more slots 20 extend downwardly from the top of the holder for a suitable distance. In the cover portion these slots are of about the same width as the dies to be used in the hammer but in the back portion the slots are undercut so as to provide larger openings 20a, which are dovetailed as at 22,

Cartridge members 24 of substantially the same width as the slots 20a in the rear portion l8 of the holder have complementarydovetails 2 6 so that they can be dropped into the slots 20a and be held therein by the cooperating dovetails.

Suitable dies D are adapted to be mounted in the cartridges 24 and are so disposed that the face portions 28 thereof will extend through and somewhat beyond the cover portion It When the cartridges are dropped into the slots 20. Also the rear ends 30 are adapted to extend a little beyond the inner face of the back portion of the holder 8. Any suitable number of dies may be disposed in the cartridges, depending of course on the depth of the slots and the corresponding length of the cartridges. The dies have cut-out or elongated grooved portions 32 along one side thereof and the cartridges are provided with semi-cyclindrical vertical grooves 34. Thus with the dies properly positioned in the cartridges with the grooves 32 opposite the groves 34, pins 36 may be dropped therethrough to hold the dies in the cartridges. The grooves 32 permit a limited amount of lost motion to the dies so that they will not transmit any shock to the head of the hammer when struck by the anvil. Closing the die holder so that the raer portion is disposed in the annular head of the hammer prevents displacement of the cartridges.

It is evident of course that instead of using a smgle cartridge to fill each of the slots as shown, a plurality of shorter cartridges can be used, if such arrangement is better suited for certain marking requirements.

With this improved manner of mounting dies on a pneumatic hammer, the desired dies can be prearranged in cartridges so that all the operator of the hammer has to do to change the dies is open the pivotally mounted holder and lift out a certain cartridge or cartridges and drop the previously prepared cartridges in the slots. This can of course be much more quickly done than changing dies in conventional holdersv and without danger of losing the holding pins.

While I have shown and described one specific embodiment of my invention, it will be understood that this embodiment is merely for the purpose of illustration and description and that various other forms may be devised within the scope of my invention, as defined in the appended claims.

I claim:

1. In combination with amarking hammer having an open-end head and a reciprocable marking die striking anvil disposed in said head to swing outwardly therefrom, a die holder movably mounted on said head, said die holder having a cover portion adapted to be disposed on the face of said head and a rearward portion adapted to be disposed in said annular head, said die holder having slots extending downwardly from the upper part thereof and die assemblies disposed in said slots, said slots being closed by said head when the rearward portion of said holder is disposed therein and opened for removal of said assemblies when said holder is pivoted outwardly from said head.

2. In combination with a marking hammer having an open-end head and a reciprocable marking die striking anvil disposed in said head, a die holder pivotally mounted on said head adapted to extend into said head and to swing outwardly therefrom, said die holder having at least one slot extending inwardly from the periphery thereof, a. cartridge member slidably mounted in said slot, said slot and said cartridge having complementary dovetails and marking dies disposed in said cartridge member, said slot being closed by said head when said holder is disposed therein and open for removal of said cartridge when said holder is removed from said head.

3. In combination with a marking hammer having an open-end annular-like head, a reciprocaole marking die striking anvil disposed in said head, a die holder pivotally mounted on said head having a cover portion adapted to be disposed on the face of the head and a rearward portion adapted to be disposed in said annularlike head, said die holder having at least one slot extending inwardly from the periphery thereof and through said cover and rearward portion, the portion of said slot in said rearward portion being undercut and dovetailed, a cartridge member adapted to be disposed in the undercut portion of said slot and having a complementary dovetail engaging the dovetail in said slot, and a marking die disposed in said cartridge extending through the cover portion of. said holder whereby said cartridge is held in said die holder by said annular head when said rearward portion is disposed therein and is readily removable from the die holder when it is pivoted outwardly from said head.

4. In combination with a marking hammer having an open-end head, a reciprocable marking die striking anvil disposed adjacent the rearward side of said head, a die holder pivotally mounted on the forward side of said head adapted to extend thereinto and to swing outwardly away therefrom, said holder having at least one slot extending inwardly towards its mid-portion from the periphery thereof, a cartridge member slidably disposed in said slot and marking dies in said cartridge member, said marking dies having a lost motion mounting in said cartridge, said cartridge being held in said slot by said head when said holder is disposed therein and readily removable therefrom when said holder is pivoted outwardly away from said head.

5. In combination with a marking hammer having an open-end head, a reciprocable marking die striking anvil disposed adjacent the rearward side of said head, a die holder movably mounted on the forward side of said head adapted to extend thereinto and to be moved outwarclly therefrom, said holder having at least one slot extending inwardly towards its mid-portion from the periphery thereof, a cartridge member disposed in said slot and marking dies in said cartridge member, said dies having a lost motion mounting in said cartridge, said cartridge being held in said slot by said head when said holder is disposed therein and readily removable therefrom when said holder is moved outwardly from said head.

6. A holder for marking dies adapted to be disposed in an open-end annular-like head adjacent reciprocable striking anvil therein and including means for releasably latching the holder in said head, comprising a plate member havingforward and rearward faces, said plate member having at least one open-end slot extending inwardly from the periphery thereof and through its forward and rearward faces, the rearward portion of said slot being undercut and dovetailed, a cartridge member disposed in the undercut portion of said slot and having a complementary dovetail slidingly engaging the dovetail in said slot, said cartridge being readily removable from said holder when said holder is not disposed in said annular-like head and being locked in said holder by the inner face of said head when said holder is held in said head by said latching means and at least one marking die disposed in said cartridge extending beyond the forward and rearward faces of said plate member whereby the rearward end of said die may be struck by said anvil when said holder is disposed in said head with the outer marking end in contact with an article to be marked thereby, said die having an elongated groove along one side thereof, an oppositely disposed groove on the inner side of said cartridge and a pin in said groove holding said die in said cartridge and providing a lost motion mounting therefor to permit actuation of said die by said anvil without shock to said cartridge and holder.

RALPH A. PANNIER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 979,586 Sorg Dec. 27, 1910 1,187,085 Parker June 13, 1916 1,665,220 'Rettmer Apr. 10, 1928 1,733,876 Halvorsen Oct. 29, 1929 1,743,840 Witte Jan. 14, 1930 1,753,173 Pope Apr. 1, 1930 1,763,090 Buzza June 10, 1930 1,987,370 Pleger Jan. 8, 1935 2,317,861 Speicher Apr. 27, 1943 2,348,566 Papazian May 9, 1944 2,427,358 Kovach Sept. 16, 1947 

